Method:
1) Preheat oven to 160 C
2) Use an electric mixer to beat butter until pale and creamy
3) Add flour, icing sugar, and custard powder. Use a wooden spoon to stir to combine
4) Use your hands to roll teaspoonfuls of dough mixture into balls.
5) Place balls 3cm apart on lined trays.
6) Dust fork in extra icing sugar and use to gently flatten the balls.
7) Bake in the oven for 15 minutes
8) Set aside to cool for 30 minutes while you make the filling.(For the filling)
1) Use an electric mixer to beat the butter and icing sugar until light and fluffy
2) Add lemon rind and juice and beat to combine
3) Spread the mixture on the flat side of the biscuits and sandwich together with remaining biscuits.